com/courses/78593/quizzes/401119/take D Question 11 1 pts Which critical value is appropriate for a 99% confidence level where n = 17; o is unknown and the population appears to be normally distributed? O ta/2 = 2.921 O za/2 = 2.567 O ta/2 = 2.898 O za/2 = 2.583 D Question 12 1 pts Scores on a test have a mean of 70 and Q3 is 83. The scores have a distribution that is approximately normal. Find Poo. (You will need to first find the standard deviation.) 95,6 94.8 0 93,7 92.9